V2 app support step2 : Use NativeAppWindow for Activity's window.

athena/content/app_activity_proxy.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ATHENA_CONTENT_APP_ACTIVITY_PROXY_H_
 #define ATHENA_CONTENT_APP_ACTIVITY_PROXY_H_
 
 #include <vector>
 
 #include "athena/activity/public/activity.h"
@@ skipping 25 matching lines @@
   virtual bool IsVisible() OVERRIDE;
   virtual ActivityMediaState GetMediaState() OVERRIDE;
   virtual aura::Window* GetWindow() OVERRIDE;
 
   // ActivityViewModel overrides:
   virtual void Init() OVERRIDE;
   virtual SkColor GetRepresentativeColor() const OVERRIDE;
   virtual base::string16 GetTitle() const OVERRIDE;
   virtual bool UsesFrame() const OVERRIDE;
   virtual views::View* GetContentsView() OVERRIDE;
+  virtual views::Widget* CreateWidget() OVERRIDE;
   virtual void CreateOverviewModeImage() OVERRIDE;
   virtual gfx::ImageSkia GetOverviewModeImage() OVERRIDE;
   virtual void PrepareContentsForOverview() OVERRIDE;
   virtual void ResetContentsView() OVERRIDE;
 
  private:
   // The creator of this object which needs to be informed if the object gets
   // destroyed or the application should get restarted.
   AppActivityRegistry* app_activity_registry_;
 
   // The presentation values.
   const base::string16 title_;
   const gfx::ImageSkia image_;
   const SkColor color_;
 
   // The activity which gets replaced. It is used to sort the activity against
   // upon initialization. Once moved, this value gets reset since the object
   // can go away at any time.
   Activity* replaced_activity_;
 
   // The associated view.
   views::View* view_;
 
   DISALLOW_COPY_AND_ASSIGN(AppActivityProxy);
 };
 
 }  // namespace athena
 
 #endif  // ATHENA_CONTENT_APP_ACTIVITY_PROXY_H_